139 lines
4.5 KiB
C++
139 lines
4.5 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
|
|
|
|
/** \file
|
|
*
|
|
* Example \ref example_mask.cc "example_mask.cc" .
|
|
*
|
|
* \ingroup g_mask
|
|
*/
|
|
|
|
/** \example example_mask.cc
|
|
*
|
|
* This example demonstrates how to use Mask. It displays all the
|
|
* mask keys for a particular PackageID.
|
|
*/
|
|
|
|
#include <paludis/paludis.hh>
|
|
#include "example_command_line.hh"
|
|
#include <iostream>
|
|
#include <iomanip>
|
|
#include <cstdlib>
|
|
#include <set>
|
|
#include <time.h>
|
|
|
|
using namespace paludis;
|
|
using namespace examples;
|
|
|
|
using std::cout;
|
|
using std::endl;
|
|
using std::left;
|
|
using std::setw;
|
|
|
|
namespace
|
|
{
|
|
/* We use this visitor to display extra information about a Mask,
|
|
* depending upon its type. */
|
|
class MaskInformationVisitor
|
|
{
|
|
public:
|
|
void visit(const UserMask &)
|
|
{
|
|
cout << left << setw(30) << " Class:" << " " << "UserMask" << endl;
|
|
}
|
|
|
|
void visit(const UnacceptedMask & mask)
|
|
{
|
|
cout << left << setw(30) << " Class:" << " " << "UnacceptedMask" << endl;
|
|
cout << left << setw(30) << " Unaccepted key:" << " " << mask.unaccepted_key_name() << endl;
|
|
}
|
|
|
|
void visit(const RepositoryMask & mask)
|
|
{
|
|
cout << left << setw(30) << " Class:" << " " << "RepositoryMask" << endl;
|
|
cout << left << setw(30) << " Mask file:" << " " << mask.mask_file() << endl;
|
|
if (! mask.comment().empty())
|
|
cout << left << setw(30) << " Comment:" << " " << mask.comment() << endl;
|
|
if (! mask.token().empty())
|
|
cout << left << setw(30) << " Token:" << " " << mask.token() << endl;
|
|
}
|
|
|
|
void visit(const UnsupportedMask & mask)
|
|
{
|
|
cout << left << setw(30) << " Class:" << " " << "UnsupportedMask" << endl;
|
|
cout << left << setw(30) << " Explanation:" << " " << mask.explanation() << endl;
|
|
}
|
|
};
|
|
}
|
|
|
|
int main(int argc, char * argv[])
|
|
{
|
|
int exit_status(0);
|
|
|
|
try
|
|
{
|
|
CommandLine::get_instance()->run(argc, argv,
|
|
"example_mask", "EXAMPLE_MASK_OPTIONS", "EXAMPLE_MASK_CMDLINE");
|
|
|
|
/* We start with an Environment, respecting the user's '--environment' choice. */
|
|
std::shared_ptr<Environment> env(EnvironmentFactory::get_instance()->create(
|
|
CommandLine::get_instance()->a_environment.argument()));
|
|
|
|
/* Fetch package IDs for 'sys-apps/paludis'. */
|
|
std::shared_ptr<const PackageIDSequence> ids((*env)[selection::AllVersionsSorted(
|
|
generator::Package(QualifiedPackageName("sys-apps/paludis")))]);
|
|
|
|
/* For each ID: */
|
|
for (PackageIDSequence::ConstIterator i(ids->begin()), i_end(ids->end()) ;
|
|
i != i_end ; ++i)
|
|
{
|
|
cout << **i << ":" << endl;
|
|
|
|
/* For each mask key: */
|
|
for (PackageID::MasksConstIterator m((*i)->begin_masks()), m_end((*i)->end_masks()) ;
|
|
m != m_end ; ++m)
|
|
{
|
|
/* All Mask instances have two basic bits of information: a one
|
|
* character short key, and a longer description. */
|
|
cout << left << setw(30) << " Key:" << " " << std::string(1, (*m)->key()) << endl;
|
|
cout << left << setw(30) << " Description:" << " " << (*m)->description() << endl;
|
|
|
|
/* To display more information about a Mask we create a visitor
|
|
* that visits the appropriate subtype. */
|
|
MaskInformationVisitor v;
|
|
(*m)->accept(v);
|
|
|
|
cout << endl;
|
|
}
|
|
|
|
cout << endl;
|
|
}
|
|
}
|
|
catch (const Exception & e)
|
|
{
|
|
/* Paludis exceptions can provide a handy human-readable backtrace and
|
|
* an explanation message. Where possible, these should be displayed. */
|
|
cout << endl;
|
|
cout << "Unhandled exception:" << endl
|
|
<< " * " << e.backtrace("\n * ")
|
|
<< e.message() << " (" << e.what() << ")" << endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
catch (const std::exception & e)
|
|
{
|
|
cout << endl;
|
|
cout << "Unhandled exception:" << endl
|
|
<< " * " << e.what() << endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
catch (...)
|
|
{
|
|
cout << endl;
|
|
cout << "Unhandled exception:" << endl
|
|
<< " * Unknown exception type. Ouch..." << endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
return exit_status;
|
|
}
|
|
|